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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      /* .title {
        background-color: #999;
        color: white;
      }
      .title span {
        color: brown;
      } */
    </style>
    <style>
      /* .title {
        background-color: #999;
        color: white;
        span {
          color: brown;
        }
      } */
    </style>
    <!-- <link rel="stylesheet" href="./scss/base.scss" /> -->
    <link rel="stylesheet" href="./scss/base.css" />
  </head>
  <body>
    <p class="title">
      段落
      <span>强调文本</span>
      段落
      <span class="border">边框</span>
    </p>
    <hr />
    <span class="border">外部span</span>
    <hr />
    <div class="btn">点击</div>
  </body>
</html>
